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CC2530ZNP Mini-kit and RSSI

Fulvio Gollinelli
Prodigy 60 points

Other Parts Discussed in Thread: CC2530

Hi all,

I bought the CC2530ZNP Mini-kit and I'm making some very simple communication test between the boards (programming them with IAR Embedded Workbench).

In particular, I set up one board as coordinator and the other one as an end device using the sample application Basic Communication (communication example workspace).

The endpoint sends a data packet (the string "hello!"), the coordinator receives and displays it. That's all.

I need to know how to extract the RSSI value from the arrived packet on the coordinator.

In the T.I. document "CC2530 Software examples user's guide" i found some RSSI-related function and data structure but i didn't find them on the software ZNP API that came with my kit.

Any help is appreciated!

Bye

  • 0
    Prodigy 240 points

    Hi,

    I'm the same question, somebody could you help us?

    goal: get rssi value from sensor (router send to coordinator).

    important datas:

    CC2530.

    IAR

    source path: Simple Application from CC2530 Mini Kit / ZNP Examples/ IAR/ Simple Application.eww

    without more, regards

  • 0 in reply to Leonardo Costa
    Guru 735695 points

    When there is an AF_INCOMING_MSG from sensor, there should be LQI included in it. You can use it to calculate RSSI.

  • 0 in reply to YiKai Chen
    TI__Genius 16570 points
    Hi,
    AF_INCOMING_MSG has a field called LinkQuality which holds the information about the quality of the single hop radio link in a range from 0-255.
    The number comes from a simple clip and linearization formula which takes into account both correlation and RSSI. We give customers the option to whether use RSSI only mode, or RSSI and correlation.
    In the pre-compiled ZNP firmware, the LinkQuality value is simply a clip-linearized version of the RSSI only and what needs to be reversed.

    LinkQuality = [255* (RSSI-MIN_ED)]/[MAX_ED-MIN_ED]

    Therefore with simple algebra
    RSSI = MIN_ED+LinkQuality*( MAX_ED-MIN_ED)/255

    Default values for MIN_ED and MAX_ED are -87 and 10 respectively.

    The code I am referring to above is implemented as a reference in radioComputeED() function in mac_radio.c module that I suggest to look at for your reference.

    Thanks,
    TheDarkSide